Update apps Automatically or not
In the Google Play app, tap the Play Store icon at the top left of the screen to bring up the left-hand menu.
Now select Settings and then tap the ‘Auto Update apps’ option. Here you can choose if you want apps to update automatically and if so, only over Wi-Fi or also 3G. Remember that by allowing apps to automatically update over 3G, you will need a generous data allowance to avoid extra charges from your network provider. If you choose manual updates, you will see an Update button in each app listing, prompting you to update when they are available, and also see notifications alerting you to the changes. You have full control over how app updates are handled.